I posted a video here awhile ago (can't find the thread now) and asked if the high pitched 'whistle' sound was 'normal' or not. I got one guy that said his does the same and others ignored it, meaning (I guess) that theirs doesn't make the same noise.

Anyhoot, it turns out that I do have a bad motor (bearing). Just going to replace it as I couldn't ship it back for the $13 I paid for the motor. Not to mention DJI would likely charge me for the repair anyway.

I posted a video here awhile ago (can't find the thread now) and asked if the high pitched 'whistle' sound was 'normal' or not. I got one guy that said his does the same and others ignored it, meaning (I guess) that theirs doesn't make the same noise.

Anyhoot, it turns out that I do have a bad motor (bearing). Just going to replace it as I couldn't ship it back for the $13 I paid for the motor. Not to mention DJI would likely charge me for the repair anyway.

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I posted a short time ago asking the same question ,although mine only did it after I flipped over on the ground .I didn't get a reply either .Looked at footage of how to replace it .Getting the shell apart isn't easy but the main decision seems to be a choice between re soldering to the board or cutting the wires and soldering to them. I favor the latter .Mine ran smooth initially so yours should be I assume..

I forgot to say I determined which motor it was by getting my son to increase the speed while I tilted the P3 to each of the four sides . Spinning them by hand revealed little. You may have done this sort of test

I posted a video here awhile ago (can't find the thread now) and asked if the high pitched 'whistle' sound was 'normal' or not. I got one guy that said his does the same and others ignored it, meaning (I guess) that theirs doesn't make the same noise.

Anyhoot, it turns out that I do have a bad motor (bearing). Just going to replace it as I couldn't ship it back for the $13 I paid for the motor. Not to mention DJI would likely charge me for the repair anyway.

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I have this kind of sound since the first day I got the p3s, there is no problem with it

Brushless or not, has nothing to do with the bearings.The motor still runs. I can still fly it. But the whistle has gotten progressively louder than when the video was made. As has the stability issue.

When I made the video, I set the P3S to hover and I went back inside to get the camera. It stayed in place as it should have. It won't do that now.My only conclusion is that the motor, with lateral play, plays a huge role.

Can you keep us posted? Mine does that as well but I think it's normal. I sent a video in to drone nerds and they said that's the noise it makes. My friend has a p3s and his made the same noise and I've seen quite a few videos with the same noise. The whistling. I to thought that it wasn't normal and got a little panicking and started asking around and that's when I saw other videos of people posting vibration videos and in all of them I hear the same whistle. I'm curious though if it stops when you change the motor.